Rotary fluid motor

ABSTRACT

A fluid motor having a fixed cylindrical casing, supporting a rotor having an output shaft extending rotatably and coaxially in the casing. The rotor includes piston chambers and reciprocable pistons in the piston chamber. A piston rod of each piston is connected to a crankshaft connected to the rotor for rotation therewith. The casing has inlet and outlet ports communicating with the piston chambers during rotation of the rotor to admit compressed fluid through the inlet-port and discharge from the outlet-port. A drive train synchronizes rotation of the crankshafts and the output shaft, a gear tooth ratio of an annular gear to pinion gears on the crankshafts is preferably twice the number of pistons in each rotor block.

FIELD OF THE INVENTION

The present invention relates generally to fluid machinery and, morespecifically, to a rotary fluid motor of the type includingreciprocating pistons, which rotate around its axis of rotation.

DESCRIPTION OF THE PRIOR ART

Refer to my prior inventions;

Patent No.: 16130 (Thailand) INTERNAL COMBUSTION ROTARY ENGINE,

Patent No.: U.S. Pat. No. 6,536,383 B2 INTERNAL COMBUSTION ROTARYENGINE,

Patent No.: U.S. Pat. No. 6,813,989 B2 ROTARY COMPRESSOR OR PUMP,

Patent No.: EP 1 085 182 B1 INTERNAL COMBUSTION ROTARY ENGINE,

Patent No.: 3377968 (Japan) INTERNAL COMBUSTION ROTARY ENGINE,

Application No. 095096 (Thailand) ROTARY FLUID MOTOR

Alternative embodiments envision the use of the invention as a fluidmotor. A fluid motor has the same structure as that of the rotaryinternal combustion engine, including cylindrical casing, a rotor withan output shaft as its axis in the cylindrical casing and crankshafts,pistons, piston chambers within the rotor. Each piston chamber undergoesdownward movement by pressured-fluid through inlet-port and isdischarged through outlet-port.

SUMMARY OF THE INVENTION

A fluid motor comprising: a casing defining a cylindrical chamber; arotor with input shaft as the axis is in the said cylindrical chamber,crankshaft with pinion gear at the rear end in the rotor; piston chamberand piston in the rotor exists; drive train is provided to synchronizethe rotation of the input shaft and the crankshaft.

BRIEF DESCRIPTION OF THE DRAWING

The above and other objects and advantages of the present invention willbe understood with reference to the following detail description ofembodiment thereof which is illustrated, by way of example, in theaccompanying graphics; in which:

FIG. 1 is a diagrammatically illustrate inlet-port and outlet-portposition of first block of rotary fluid motor,

FIG. 2 is a diagram of inlet-port and outlet-port position of secondblock of rotary fluid motor,

FIG. 3 is a perspective assembly view of the rotary fluid motor,

FIG. 3A is a perspective exploded view of the rotary fluid motor

FIG. 4 is a sectional view of front end plate of casing, screw gearchamber, and crankshaft front mounting plate and its' exploded view,

FIG. 5 is a sectional view of rear end plate of casing, drive trainchamber and crankshaft rear mounting plate and its' exploded view,

FIG. 6 is an exploded perspective view of piston chamber base andcylindrical shape valve and detail of a connection spring stem and coilspring of cylindrical valve,

FIG. 7 is a perspective view showing interior details of the cylindricalshape valve and side view of FIG. 6,

FIG. 8 is rear view of fluid motor,

FIG. 9 is front view of fluid motor,

FIG. 10 is a perspective view of an annular body of the rotor,

FIG. 11 is a perspective view of a crankshaft middle mounting plate,

FIG. 12 is a perspective view of a crankshaft front mounting plate,

FIG. 13 is a perspective view of a crankshaft rear mounting plate,

FIG. 14 is a perspective view of output shaft and crankshaft mountingarm,

FIG. 15 diagrammatically illustrate inlet-stroke of the first rotarymotor block and the concurrent outlet-stroke of the second rotary motorblock,

FIG. 16 illustrate the outlet-stroke of the first rotary motor block andthe concurrent inlet-stroke of the second rotary pressurizing motorblock,

DETAILED DESCRIPTION

The illustrated fluid motor comprises a casing formed of a pair of endplate 11, 13 and outer cylinder 15 securely assembled as shown toenclose a cylindrical rotor. Outlet-port 2 and inlet-port 1 extendthrough the outer cylinder 15 to provide communication with the pistonchamber.

The cylindrical rotor includes two annular bodies 8 having a cylindricalouter surface matching the cylindrical inner surface formed by outercylinder 15 and has output shaft 3 as axis. The rotor includesfront-mounting plate of crankshaft 9 (with it's cover), andrear-mounting plate of crankshaft 10 secured against the annular bodies8. Between two annular bodies 8 of the rotor is crankshaft middlemounting plate that comprises output shaft arm mounting plate 43 and itscover 44 (detail of plate 43 and its cover 44 are shown in FIG. 11). Theoutput shaft 3 is rotably mounted and extend through the casing bysleeve bearing mounted in the end plates 11, 13 of the casing.

The axis of output shaft 3 and the axis of rotor are the same axis (orconcentric) and rotate together.

As shown in FIG. 14, a crankshaft-mounting arm 56 is fixedly secured onthe output shaft 3 for bodily rotation with it. A crankshaft-mountingarm 56 includes bearing housing 53, 55 and bearing 54. Piston chambersare fixedly secured with piston chamber bases 27 inside annular body ofrotor 8. Each piston chamber axially extends to the outer surface ofannular bodies of rotor 8, and wrapped by its cylindrical shape valve 7.In FIG. 10, seal 42 is inserted in rotor annular bodies 8 to protectlube oil leak from cylindrical shape valve 7. Axis of each pistonchamber is preferably uniformly spaced from output shaft axis in thedirection of rotor rotation. The cylindrical shape valve 7 is slightlymovable along the axis of its piston chamber. The curved end of thevalve is pressed with inner cylindrical surface of outer cylinder ofcasing 15 by coil springs 31 to fluid tight. As shown in FIG. 6, thecoil springs 31 is seated in spring stem 32 that mounted on pistonchamber bases 27 and lower end of cylindrical shape valve 7 to preventcylindrical valve from moving. At the outer surface of piston chamberbase 27 has ring-seal 28 covered to prevent lube oil leak fromcylindrical valve 7. Key 29 with spring is mounted in keyway 30, 34 onoutside of each piston chamber and inside of its cylindrical shape valve7 respectively. As shown in FIG. 7, opening valve 35 and closing valve36 are formed at the curve end of cylindrical shape valve 7, openingvalve 35 to locate the start opening position of outlet-port andinlet-port, and closing valve 36 to locate the start closing position ofoutlet-port and inlet-port. A piston 6, normally of cylindrical shapesimilar to conventional construction, is reciprocating in each pistonchamber. A piston rod is pivotally connected to each piston 6 androtatively connected to its corresponding crank of crankshaft 5 bybearing 54. The fluid motor has two motor blocks, the first and thesecond block, and each block has two pistons. The first motor block,piston chamber bases 27 are fixedly secured on crankshaft front mountingplate 9 and cover of output shaft arm mounting plate 44. The secondmotor block, piston chamber bases 27 are fixedly secured on crankshaftrear mounting plate 10 and output shaft arm mounting plate 43.

FIG. 4, between front end plate of casing 13 and crankshaft frontmounting plate cover 9 is screw gear chamber 14, which enclose screwgear 4. The screw gear 4 is formed on the front end of output shaft 3for driving lube oil pump.

A drive train is provided to synchronize the rotation of the outputshaft 3 and both of the crankshafts 5. As shown in FIG. 5, the drivetrain includes an annular gear-carrying cap 22 in drive train chamber12. The drive train chamber 12 is between rear end plate of casing 11and crankshaft rear mounting plate 10. A sleeve carry the output shaftis formed at the center of annular gear-carrying cap 22 with one end ofthis sleeve fixedly secured to rear end plate of casing 11. An annulargear 23 is fixed to the annular gear-carrying cap 22. The annular gear23 mesh with pinion gears formed on the rear end of both crankshafts 5.The drive train shall specify the gear teeth ratio of annular gear topinion gear to be appropriate to rotary fluid motor efficiencypreferably twice the number of pistons in each motor block. For example,in a typical two-piston rotary pressurizing motor the gear teeth rationof annular gear to pinion gear shall be 4:1 so that when the outputshaft rotates one round clockwise, the crankshafts will rotate fourrounds. Similarly, the gear teeth ration of 3, 4, 6, 8 pistons rotarypressurizing motor shall be 6:1, 8:1, 12:1 and 16:1 respectively.

As output shaft 3 and crankshafts 5 concurrently rotate, the pistons 6reciprocate in their piston chamber due to the rotation of crankshaft 5.The reciprocation of the pistons is synchronized to receivepressured-fluid through inlet-port 1 (inlet-stroke) and discharge fromoutlet-port 2 (outlet-stroke).

As an example, operation sequence of the rotary pressurizing motor asshown in FIG. 15 and FIG. 16 illustrates two sets piston of motor block.Each block comprises two-pistons.

During inlet-stroke of the first motor block (FIG. 15 position 57, 58,59), piston chamber No. 1 & 2 passes through the inlet-port while thepiston moves down by the pressured-fluid into its piston chamber. Whenthe piston complete it downward-stroke, the inlet-stroke is alsocomplete. At the same time the second motor block is operated inoutlet-stroke (FIG. 15 position 60, 61, 62).

Outlet-stroke of the first motor block (FIG. 16 position 63, 64) occurswhen piston chamber No. 1 & 2 continues moving around the output shaftwhile the crankshaft drives piston No. 1 & 2 move up to discharge fluid.At the same time the second motor block is operating in inlet-stroke(FIG. 16 position 65, 66).

Piston chamber No. 1 and No. 2 make the first motor block while pistonchamber No. 3 and No. 4 make the second piston chamber set. The movementof each pair of piston must be balanced in order to maximize theoutput-power. However, this does not limit variation of the invention.Depending on the capacity required, the rotary pressurizing motor mightcomprise a plurality of motor block preferably. Again, one motor blockmay comprise a plurality of pistons and piston chambers preferably atleast two for the same requirement for balancing. Moreover, the inletstroke of each piston will substantially twice to no. of piston in eachmotor block that are six, eight, twelve and sixteen for 3, 4, 6, 8pistons motor block.

1. A rotary fluid motor comprising: a fixed cylindrical casing, a rotorin said casing, said rotor having an output shaft extending rotatablyand co-axially in said casing, said rotor including a plurality ofpiston chambers and respective pistons in said piston chambers, saidpistons being reciprocable in said chambers along lines spaced radiallyfrom an axis of rotation of said output shaft and said pistons eachhaving a piston rod connected to a crankshaft connected to said rotorfor rotation therewith, said casing having fluid inlet-ports andoutlet-ports communicating with said piston chambers during rotation ofsaid rotor to admit pressured-fluid through said inlet-port anddischarge from outlet-port, a valve member on said piston chamber toprovide respective communication between said inlet and outlet ports andsaid piston chamber, said valve member having cylindrically shaped endcorresponding to said cylindrical casing to close said ports when saidvalve member is closed, a drive train synchronizing rotation of the saidcrankshaft and said output shaft, the gear teeth ratio of annular gearto pinion gear to be appropriate to engine efficiency preferably twicethe number of pistons in each engine block, two, three, four, five, sixpiston engine shall be 4:1, 6:1, 8:1, 10:1, 12:1 respectively, and saidpistons undergoing reciprocal movement in said piston chambers insynchronism in which the pistons all have the same stroke position insaid chambers.
 2. The rotary fluid motor of claim 1, wherein said rotorincludes a plurality of blocks each including a plurality of saidpistons and piston chambers.
 3. The rotary fluid motor of claim 2,wherein said piston chambers and said pistons are arranged in saidblocks in pairs in opposition to one another.
 4. The rotary fluid motorof claim 1, comprising a crank arm connected to said rotor, said pistonrods being connected to respective ends of said crank arm.
 5. The rotaryfluid motor of claim 2, wherein each said block includes a mountingplate rotatably supporting one end of the crankshafts of the pistons insaid block, and a middle mounting plate disposed between adjacent blocksto rotatably support opposite ends of the crankshafts of the pistons inthe adjacent blocks.
 6. The rotary fluid motor of claim 5, wherein saidvalve casings are secured to said mounting plates.
 7. The rotary fluidmotor of claim 1, wherein each piston has a curved end corresponding inshape to the cylindrical casing.